rename headers to match style

Moving headers from ".h" to ".hpp"

Reworked the header inclusion a bit so that host-ipmid is treated as a
library, and local headers aren't.

renamed apphandler.h => apphandler.hpp
renamed chassishandler.h => chassishandler.hpp
renamed globalhandler.h => globalhandler.hpp
renamed sensorhandler.h => sensorhandler.hpp
renamed storageaddsel.h => storageaddsel.hpp
renamed storagehandler.h => storagehandler.hpp
renamed systemintfcmds.h => systemintfcmds.hpp

Change-Id: I9d4ce3dd57e2e996800f9020a10cc10cdf2c3914
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/oemrouter.cpp b/oemrouter.cpp
index 64944db..ecfe096 100644
--- a/oemrouter.cpp
+++ b/oemrouter.cpp
@@ -1,7 +1,6 @@
-#include "host-ipmid/oemrouter.hpp"
-
 #include <cstdio>
 #include <cstring>
+#include <host-ipmid/oemrouter.hpp>
 #include <map>
 #include <utility>